gecko/python/which/launcher.cpp

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/*
* Copyright (c) 2002-2003 ActiveState Corp.
* Author: Trent Mick (TrentM@ActiveState.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* Console launch executable.
*
* This program exists solely to launch:
* python <installdir>/<exename>.py <argv>
* on Windows. "<exename>.py" must be in the same directory.
*
* Rationale:
* - On some Windows flavours .py *can* be put on the PATHEXT to be
* able to find "<exename>.py" if it is on the PATH. This is fine
* until you need shell redirection to work. It does NOT for
* extensions to PATHEXT. Redirection *does* work for "python
* <script>.py" so we will try to do that.
*/
#ifdef WIN32
#include <windows.h>
#include <process.h>
#include <direct.h>
#include <shlwapi.h>
#else /* linux */
#include <unistd.h>
#endif /* WIN32 */
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
//---- constants
#define BUF_LENGTH 2048
#define MAX_PYTHON_ARGS 50
#define MAX_FILES 50
#define MAXPATHLEN 1024
#ifdef WIN32
#define SEP '\\'
#define ALTSEP '/'
// path list element separator
#define DELIM ';'
#else /* linux */
#define SEP '/'
// path list element separator
#define DELIM ':'
#endif
#ifdef WIN32
#define spawnvp _spawnvp
#define snprintf _snprintf
#define vsnprintf _vsnprintf
//NOTE: this is for the stat *call* and the stat *struct*
#define stat _stat
#endif
//---- globals
char* programName = NULL;
char* programPath = NULL;
#ifndef WIN32 /* i.e. linux */
extern char **environ; // the user environment
#endif /* linux */
//---- error logging functions
void _LogError(const char* format ...)
{
va_list ap;
va_start(ap, format);
#if defined(WIN32) && defined(_WINDOWS)
// put up a MessageBox
char caption[BUF_LENGTH+1];
snprintf(caption, BUF_LENGTH, "Error in %s", programName);
char msg[BUF_LENGTH+1];
vsnprintf(msg, BUF_LENGTH, format, ap);
va_end(ap);
MessageBox(NULL, msg, caption, MB_OK | MB_ICONEXCLAMATION);
#else
fprintf(stderr, "%s: error: ", programName);
vfprintf(stderr, format, ap);
va_end(ap);
#endif /* WIN32 && _WINDOWS */
}
void _LogWarning(const char* format ...)
{
va_list ap;
va_start(ap, format);
#if defined(WIN32) && defined(_WINDOWS)
// put up a MessageBox
char caption[BUF_LENGTH+1];
snprintf(caption, BUF_LENGTH, "Warning in %s", programName);
char msg[BUF_LENGTH+1];
vsnprintf(msg, BUF_LENGTH, format, ap);
va_end(ap);
MessageBox(NULL, msg, caption, MB_OK | MB_ICONWARNING);
#else
fprintf(stderr, "%s: warning: ", programName);
vfprintf(stderr, format, ap);
va_end(ap);
#endif /* WIN32 && _WINDOWS */
}
//---- utilities functions
/* _IsDir: Is the given dirname an existing directory */
static int _IsDir(char *dirname)
{
#ifdef WIN32
DWORD dwAttrib;
dwAttrib = GetFileAttributes(dirname);
if (dwAttrib == -1) {
return 0;
}
if (dwAttrib & FILE_ATTRIBUTE_DIRECTORY) {
return 1;
}
return 0;
#else /* i.e. linux */
struct stat buf;
if (stat(dirname, &buf) != 0)
return 0;
if (!S_ISDIR(buf.st_mode))
return 0;
return 1;
#endif
}
/* _IsLink: Is the given filename a symbolic link */
static int _IsLink(char *filename)
{
#ifdef WIN32
return 0;
#else /* i.e. linux */
struct stat buf;
if (lstat(filename, &buf) != 0)
return 0;
if (!S_ISLNK(buf.st_mode))
return 0;
return 1;
#endif
}
/* Is executable file
* On Linux: check 'x' permission. On Windows: just check existence.
*/
static int _IsExecutableFile(char *filename)
{
#ifdef WIN32
return (int)PathFileExists(filename);
#else /* i.e. linux */
struct stat buf;
if (stat(filename, &buf) != 0)
return 0;
if (!S_ISREG(buf.st_mode))
return 0;
if ((buf.st_mode & 0111) == 0)
return 0;
return 1;
#endif /* WIN32 */
}
/* _GetProgramPath: Determine the absolute path to the given program name.
*
* Takes into account the current working directory, etc.
* The implementations require the global 'programName' to be set.
*/
#ifdef WIN32
static char* _GetProgramPath(void)
{
//XXX this is ugly but I didn't want to use malloc, no reason
static char progPath[MAXPATHLEN+1];
// get absolute path to module
if (!GetModuleFileName(NULL, progPath, MAXPATHLEN)) {
_LogError("could not get absolute program name from "\
"GetModuleFileName\n");
exit(1);
}
// just need dirname
for (char* p = progPath+strlen(progPath);
*p != SEP && *p != ALTSEP;
--p)
{
*p = '\0';
}
*p = '\0'; // remove the trailing SEP as well
return progPath;
}
#else
/* _JoinPath requires that any buffer argument passed to it has at
least MAXPATHLEN + 1 bytes allocated. If this requirement is met,
it guarantees that it will never overflow the buffer. If stuff
is too long, buffer will contain a truncated copy of stuff.
*/
static void
_JoinPath(char *buffer, char *stuff)
{
size_t n, k;
if (stuff[0] == SEP)
n = 0;
else {
n = strlen(buffer);
if (n > 0 && buffer[n-1] != SEP && n < MAXPATHLEN)
buffer[n++] = SEP;
}
k = strlen(stuff);
if (n + k > MAXPATHLEN)
k = MAXPATHLEN - n;
strncpy(buffer+n, stuff, k);
buffer[n+k] = '\0';
}
static char*
_GetProgramPath(void)
{
/* XXX this routine does *no* error checking */
char* path = getenv("PATH");
static char progPath[MAXPATHLEN+1];
/* If there is no slash in the argv0 path, then we have to
* assume the program is on the user's $PATH, since there's no
* other way to find a directory to start the search from. If
* $PATH isn't exported, you lose.
*/
if (strchr(programName, SEP)) {
strncpy(progPath, programName, MAXPATHLEN);
}
else if (path) {
int bufspace = MAXPATHLEN;
while (1) {
char *delim = strchr(path, DELIM);
if (delim) {
size_t len = delim - path;
if (len > bufspace) {
len = bufspace;
}
strncpy(progPath, path, len);
*(progPath + len) = '\0';
bufspace -= len;
}
else {
strncpy(progPath, path, bufspace);
}
_JoinPath(progPath, programName);
if (_IsExecutableFile(progPath)) {
break;
}
if (!delim) {
progPath[0] = '\0';
break;
}
path = delim + 1;
}
}
else {
progPath[0] = '\0';
}
// now we have to resolve a string of possible symlinks
// - we'll just handle the simple case of a single level of
// indirection
//
// XXX note this does not handle multiple levels of symlinks
// here is pseudo-code for that (please implement it :):
// while 1:
// if islink(progPath):
// linkText = readlink(progPath)
// if isabsolute(linkText):
// progPath = os.path.join(dirname(progPath), linkText)
// else:
// progPath = linkText
// else:
// break
if (_IsLink(progPath)) {
char newProgPath[MAXPATHLEN+1];
readlink(progPath, newProgPath, MAXPATHLEN);
strncpy(progPath, newProgPath, MAXPATHLEN);
}
// prefix with the current working directory if the path is
// relative to conform with the Windows version of this
if (strlen(progPath) != 0 && progPath[0] != SEP) {
char cwd[MAXPATHLEN+1];
char tmp[MAXPATHLEN+1];
//XXX should check for failure retvals
getcwd(cwd, MAXPATHLEN);
snprintf(tmp, MAXPATHLEN, "%s%c%s", cwd, SEP, progPath);
strncpy(progPath, tmp, MAXPATHLEN);
}
// 'progPath' now contains the full path to the program *and* the program
// name. The latter is not desire.
char* pLetter = progPath + strlen(progPath);
for (;pLetter != progPath && *pLetter != SEP; --pLetter) {
/* do nothing */
}
*pLetter = '\0';
return progPath;
}
#endif /* WIN32 */
//---- mainline
int main(int argc, char** argv)
{
programName = argv[0];
programPath = _GetProgramPath();
// Determine the extension-less program basename.
// XXX Will not always handle app names with '.' in them (other than
// the '.' for the extension.
char programNameNoExt[MAXPATHLEN+1];
char *pStart, *pEnd;
pStart = pEnd = programName + strlen(programName) - 1;
while (pStart != programName && *(pStart-1) != SEP) {
pStart--;
}
while (1) {
if (pEnd == pStart) {
pEnd = programName + strlen(programName) - 1;
break;
}
pEnd--;
if (*(pEnd+1) == '.') {
break;
}
}
strncpy(programNameNoExt, pStart, pEnd-pStart+1);
*(programNameNoExt+(pEnd-pStart+1)) = '\0';
// determine the full path to "<exename>.py"
char pyFile[MAXPATHLEN+1];
snprintf(pyFile, MAXPATHLEN, "%s%c%s.py", programPath, SEP,
programNameNoExt);
// Build the argument array for launching.
char* pythonArgs[MAX_PYTHON_ARGS+1];
int nPythonArgs = 0;
pythonArgs[nPythonArgs++] = "python";
pythonArgs[nPythonArgs++] = "-tt";
pythonArgs[nPythonArgs++] = pyFile;
for (int i = 1; i < argc; ++i) {
pythonArgs[nPythonArgs++] = argv[i];
}
pythonArgs[nPythonArgs++] = NULL;
return _spawnvp(_P_WAIT, pythonArgs[0], pythonArgs);
}
//---- mainline for win32 subsystem:windows app
#ifdef WIN32
int WINAPI WinMain(
HINSTANCE hInstance, /* handle to current instance */
HINSTANCE hPrevInstance, /* handle to previous instance */
LPSTR lpCmdLine, /* pointer to command line */
int nCmdShow /* show state of window */
)
{
return main(__argc, __argv);
}
#endif